A) \[KCl{{O}_{3}}\]
B) \[Zn{{(Cl{{O}_{3}})}_{2}}\]
C) \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]
D) \[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\]
Correct Answer: D
Solution :
Oxygen rich compounds like chlorate perchlorate\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] etc., when heated gives oxygen but ammonium dichromate gives nitrogen gas when heated. \[2KCl{{O}_{3}}\xrightarrow{\Delta }2KCl+3{{O}_{2}}\uparrow \] \[2Zn{{(Cl{{O}_{3}})}_{2}}\xrightarrow{\Delta }ZnC{{l}_{2}}+3{{O}_{2}}\] \[4{{K}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{\Delta }4{{K}_{2}}Cr{{O}_{4}}+2C{{r}_{2}}{{O}_{3}}+3{{O}_{2}}\uparrow \]\[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{{}}{{N}_{2}}\uparrow +C{{r}_{2}}{{O}_{3}}+4{{H}_{2}}O\]
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